Martin Bondéus has been developing the Bondtech extruder since 2014, using feedback from customers and beta testers to steadily improve the design. Now he has released the latest iteration, the QR (QuickRelease) which improves on the previous V2 design with its quick filament change feature. Read more at 3DPrint.com: http://3dprint.com/103312/new-bondtech-qr-extruder/